We had the 7 and this G4 is like night and day. It is so accurate and the range is good enough that I can set it by my bed and get readings 2 bedrooms away. I no longer set middle of the night alarms for me to get up and check. This is a life-changing device. My daughter was very skeptical due to bad reliability/experiences with the 7+ but even she has turned the corner on her thinking. This thing absolute rocks and dare I say is nearly accurate enough to dose off of...... Absolutely amazing device. Absolutely night and day better versus the 7. We could not be happier with it!